Breakdown of yojikanhan kakarimashita.
四yon
four
〜時〜ji
hour (counter)
半han
half
〜間〜kan
duration suffix
かかるkakaru
to take (time to do something)
Elon.io is an online learning platform
We have hundreds of Japanese lessons and thousands of exercises.
四yo時zi間kan半han かかりました。